Impermeability is best seen in

Options

A. Cork cells
B. Sclerenchyma
C. Stone cells
D. Collocytes

Answer

To answer the question "Impermeability is best seen in," we need to analyze the characteristics of the different cell types mentioned in the video transcript.

### Step-by-Step Solution:

1. **Understanding Impermeability**:
- Impermeability refers to the inability of a material to allow substances (like water, gases, etc.) to pass through it.

2. **Evaluating Cell Types**:
- **Sclerenchyma**: This type of tissue is known for providing structural support and is partially permeable, meaning it allows some substances to pass through.
- **Stone Cells**: These are a type of sclerenchyma and are also permeable, allowing some movement of substances.
- **Colenchyma**: These cells are involved in providing support while still allowing flexibility and are also selectively permeable.
- **Cork Cells**: These cells are known for their impermeability due to the presence of suberin, a waxy substance that makes them highly resistant to water and other substances.

3. **Identifying the Most Impermeable Cell Type**:
- Among the options provided, cork cells are the most impermeable due to the deposition of suberin, which prevents the passage of water, liquids, and gases. The only exceptions are through lenticels, which are specialized structures that allow gas exchange.

4. **Conclusion**:
- Therefore, the answer to the question is that impermeability is best seen in **cork cells**.

### Final Answer:
**Cork cells** are the best example of impermeability in plant tissues.

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